Merge "Improve sorting on SpecialWanted*-Pages"

diff --combined includes/specialpage/QueryPage.php
index 65e82e8,c495f93..3b3ea26
--- 1/includes/specialpage/QueryPage.php
--- 2/includes/specialpage/QueryPage.php
+++ b/includes/specialpage/QueryPage.php
@@@ -304,7 -304,7 +304,7 @@@ abstract class QueryPage extends Specia
                        return 0;
                }
  
 -              $fname = get_class( $this ) . '::recache';
 +              $fname = static::class . '::recache';
                $dbw = wfGetDB( DB_MASTER );
                if ( !$dbw ) {
                        return false;
@@@ -389,7 -389,7 +389,7 @@@
         * @since 1.18
         */
        public function reallyDoQuery( $limit, $offset = false ) {
 -              $fname = get_class( $this ) . "::reallyDoQuery";
 +              $fname = static::class . '::reallyDoQuery';
                $dbr = $this->getRecacheDB();
                $query = $this->getQueryInfo();
                $order = $this->getOrderFields();
@@@ -407,7 -407,7 +407,7 @@@
                        $options = isset( $query['options'] ) ? (array)$query['options'] : [];
                        $join_conds = isset( $query['join_conds'] ) ? (array)$query['join_conds'] : [];
  
-                       if ( count( $order ) ) {
+                       if ( $order ) {
                                $options['ORDER BY'] = $order;
                        }
  
@@@ -460,27 -460,35 +460,35 @@@
                if ( $limit !== false ) {
                        $options['LIMIT'] = intval( $limit );
                }
+ 
                if ( $offset !== false ) {
                        $options['OFFSET'] = intval( $offset );
                }
-               if ( $this->sortDescending() ) {
-                       $options['ORDER BY'] = 'qc_value DESC';
-               } else {
-                       $options['ORDER BY'] = 'qc_value ASC';
+ 
+               $orderFields = $this->getOrderFields();
+               $order = [];
+               $DESC = $this->sortDescending() ? ' DESC' : '';
+               foreach ( $orderFields as $field ) {
+                       $order[] = "qc_${field}${DESC}";
+               }
+               if ( $order ) {
+                       $options['ORDER BY'] = $order;
                }
+ 
                return $dbr->select( 'querycache', [ 'qc_type',
                                'namespace' => 'qc_namespace',
                                'title' => 'qc_title',
                                'value' => 'qc_value' ],
                                [ 'qc_type' => $this->getName() ],
-                               __METHOD__, $options
+                               __METHOD__,
+                               $options
                );
        }
  
        public function getCachedTimestamp() {
                if ( is_null( $this->cachedTimestamp ) ) {
                        $dbr = wfGetDB( DB_REPLICA );
 -                      $fname = get_class( $this ) . '::getCachedTimestamp';
 +                      $fname = static::class . '::getCachedTimestamp';
                        $this->cachedTimestamp = $dbr->selectField( 'querycache_info', 'qci_timestamp',
                                [ 'qci_type' => $this->getName() ], $fname );
                }